#include <string>
#include <iostream>
using namespace std;

class Solution
{
public:
	bool checkRecord(string s)
	{
		int absent_count = 0;
		for (int i = 0; i < s.length(); i++)
		{
			absent_count += (s[i] == 'A');
			if (absent_count > 1)
				return false;
		}
		for (int i = 0; i < (int)s.length() - 2; i++)
		{
			// cout<<i<<" "<<s[i]<<endl;
			if (s[i] == 'A' && s[i] == s[i + 1] && s[i + 1] == s[i + 2])
				return false;
		}
		return true;
	}
};

int main() {
	Solution s;
	cout<<s.checkRecord("A")<<endl;
	return 0;
}